TlIK MYKIAIMHiA 1\ I'lIK AI'Sl'K'A 1,1 A N Ml'SKTM l!K(iI,KMAXN. 91 



such a blank should exist in Pi'of. Silvesti'i's text is not sur- 

 prisino', as the diagnosis of I'J. hifdJi-ntiim is shortened, and the 

 fact that the matter was left iinspokm does not imply thattlie 

 secondary characters do not exist. As to N. t ruiixi-frxp-td'nidfinii, 

 which has been redescribed at length by Attems, it is more 

 astonishing that the Austrian authoi', wliose writings rank 

 amongst the best, should have neglected to mention the 

 structure of the fii'st pair of legs and of the tifth sternum. 

 Are we to understand that these organs show no special feature, 

 or are we to admit that, the specimens being curled up, these 

 particulars have escaped his attention p The matter is not 

 easy to decide ; and should the first alternative prove to be the 

 right one, it would become necessary to somewhat alter tlie 

 above given diagnosis of the genus. For this reason, some of 

 the characters mentioned therein, and namely the characters 

 numbered thi'ee to seven, should not be entirely relied upon 

 until they have undergone further test. 



Thus far the genus Aii.-^frdllosdiini includes six species, I.e.: — 

 ^4. tnt)ifiverKe-tivnii(tn)H, L. Koch, 1867, A. hiftilrntmu, Silvestri, 

 1898, .1. mi iihdii-i , A. t'niijijiitfi, .1. Icdxrl iisi-nntijn III and A. 

 ptlier'uhjei , S])p. nov. 



In all six cases the gonopods show thefollowingparticulars: — - 

 The coxa is crooked, with a prominent anterior surface adorned 

 with some fleecy hairs (ri>,f. PI. xiv., figs. 14, 22) ; no trace 

 of the anterior marginal process is to be seen ; the innei' hook 

 is normally developed. The femur is distinctly outlined (PI. 

 xiv., figs, 9, 14, 18), the limits being often grooved ; its surface 

 is abundantly clothed with setjie, more dense and much longer 

 in tlie vicinity of the proximal opening of the seminal duct. 

 The tibia is generally condensed and the telopodit deeply split 

 (less so in A. k(isi-insr,fir(i)/i(vi, which is a mountain dweller, and 

 has evidently been differently affected by evolution) ; the 

 tibial brancli starts fi'om the posterior (PI. xiv., fJi., tig. 8), or 

 from the outer (PI. xiv., fh. tig. 14; PI. xv., figs. 18, 21) sur- 

 face of the telopodit. 



Besides the seminal and the tibial branch, a third process is 

 generally to be seen starting from the telopodit more distally 

 than the tibial branch ; and this has to be identified as a tarsal 

 branch (PI. xiv., tah. figs., 8, 13 ; PI. xv., fig. 18). Yet its 

 existence does not appeal- to be as constant as that of the 



